PMB Pyro-Metol-Borax film developer

PMB Pyro-Metol-Borax film developer

  1. Ian Grant

    Ian Grant Subscriber

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    Ian Grant submitted a new resource:

    PMB Pyro-Metol-Borax film developer - PMB Pyro-Metol-Borax film developer



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    Last edited by a moderator: Feb 6, 2016
  2. Trask

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    Ian,

    Having no experience with pyro developers, I'm not sure if "pyro" as used in this formula is pyrogallol or pyrocatechin. When you search on "pyro" at Photog Formulary, both come up.

    Looks like an interesting formula to try out. Thanks
     
  3. Ian Grant

    Ian Grant Subscriber

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    When the word Pyro is used in a formula it's always Pyrogallol, I've not tried this developer but the implication is it's finer grained than D76.

    Pyrogallol was used in commercial D&P developers by both Ilford & Kodak because it gives clean working negatives with less base fog. A cleaner working developer will have better tonality.

    Ian
     
  4. Relayer

    Relayer Member

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    Well known pyro-metol formula is Pyro-Triethanolamine. Some time ago I was playing with Pyro+Phenidone developer with next fine grain formula:

    RD-108
    Sodium sulphite 50g
    Pyrogallol 6g
    Phenidone 0.2g
    Water 1l
    pH 8.1

    starting dev.time 9-12min.
     
  5. pentaxpete

    pentaxpete Subscriber

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    I found this in the 'BJ Almanac' and made it up and developed some outdated Kodak Tri-X 120 film in it -- time needed was 13 mins -- it did not keep well though.
     
  6. Trask

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    Pentaxpete: and how did the images come out? What did you think of the developer?
     
  7. michael_r

    michael_r Subscriber

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    Ian, interesting formula. Clearly intended to be a solvent developer and would not tan/stain. Regarding superaditivity, I would have thought at pH 7.6 and with that ratio of Metol to Pyro, the Pyro would be doing nearly nothing - perhaps a slight regenerative effect on the Metol, but I wonder if you could simply do a "Haist-76" adjustment (ie eliminate the Pyro and slightly increase the Metol or Borax - or perhaps no adjustment at all). It would be interesting to compare that to this version.
     
  8. Ian Grant

    Ian Grant Subscriber

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    Michael the original Kodak Fine grain developer used only Metol, I've posted it here on APUG. The so called Haist version based on this.

    There's two interesting articles on the Moderrn uses of Pyro written late 1930's and eearly 40's that I must put online.

    Ian
     
  9. Trask

    Trask Subscriber

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    I would look forward to reading them.
     
  10. Murray Kelly

    Murray Kelly Member

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    14 fl. oz?

    Ian I am still unable to equate 14 fl.oz. to approx 1.5L. 14 fl. oz. is nearer 400ml. Could you check that source again, please?
    Sounds more like 140 oz. or about 2 US gallon maybe? 14oz is rather left-field to me.

    Metol . . . . . . . . . . . . . . . . . . 8 gr (2g)
    Sodium Sulphite (anhyd) . . . . . . 400gr (100g)
    Borax . . . . . . . . . . . . . . . . . . 8 gr (2g)
    Water to . . . . . . . . . . . . . . . . 14 ozs *** (If US oz 1600ml - UK 1540ml)

    Murray

     
    Last edited by a moderator: Apr 17, 2013
  11. pentaxpete

    pentaxpete Subscriber

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    TRASK : you asked how the negatives came out -- well, the fog level was low enough and the negatives printed well -- after one film went through I noticed the next time I used it the negs were under -developed -- I think the developer oxidises quickly.